Tumbling mill



NOY. 24, 1931. L. D. PEI'K 1,833,301

TUMBLING MILL Filed Aug. 30, 1929 2 Sheets-Sheet l 5mm/nto@ Lows. D, PE1 K 359% Quema/13M. /MILL NOV. 24, 1931. I D, PElK 1,833,301

TUMBLING MI LL awww, ma 7n. M114 'Patented Nov. 24, 1 931` l I i UNITED' STATES PATENT@ OFFICE LOUIS D. PEIK, OF MISHAWAKA., INDIANA, ASSIGNOR TO THE AMLEJRIGAIL` FOUNDIR-Y EQUIPMENT COMPANY, OF N'EW YORK, N. Y., A CORPORATION OF DELAWARE TUMBLING MILL Application led August 30, 1929. Serial No. 389,385.

.The invention relates totumbling mills for ed to be as generic in\ their application to smoothing rough castings and the like.A similar parts as the art will permit.

Accordmg to one form which the inven- Like reference characters denote like parts tion may take the mill comprises a stationary in the several figures of the drawings.

casing in which is positioned a traveling con- Referring to the drawings, thetumbling 55 veyor or belt so arranged as to provide a mill comprisesastationary casing4enclosing receptacle for the articles treated. In effect a movable segment 5. I his casing 4 is made a tumbling barrel is formed having a stationup of a pair of end walls 6 and 7 to which the ary segment provided by the casing and a several side wall plates 8 are secured. The

10 movable segment provided by the conveyor. end walls 6 and 7 are preferably castings so Circular plates may be rotatably mounted on suitably ribbed for strength and having suitthe casing to act as heads for the barrel. lhe able attaching brackets andy flanges cast inbarrel heads, may have hollow trunnions and tegral therewith7 to which a plurality of air may be drawn in through one of the heads transverse channels 9 are provided connectand air, abrasive and dust may be removed ing the end walls 6 and 7. lhe several side 65 from theother head. Suitable devices may be Wall plates 8 are secured lto theend Walls 6 provided for separating the dust from the and 7 and to these channels 9. These plate spent abrasive. l1`he casing may support suitmembers include an upper sheet 10 in the able blast nozzles for directing abrasive upon form of an angle having a depending wall thev articles to be treated and suitable means and an exhaust sheet l1 having a plurality 70 may be provided for conveying the spent of suction pipes l2 connected thereto. abrasive which has been removed from the The casing end walls 6 and 7 are provided mill to the blast nozzles so that it can be with hollow bosses 34 and 35 in which are used over and over again. The arrangement journalled hollow projecting posts or shafts `may be such that the conveyor moves in one 36 and 37 secured to circular barrel heads 75 direction to tumble the articles, and when, re- 38 and 39. Each head 38 or 39 comprises a versed, it moves to quickly eject the articles circular plate 100 to which is secured a drum from the machine through the charge 101 and a removable liner 41 having elonopening. gated openings 102. The hea-d 39 is hollow The invention also consists in certain new and may be` called the intake head since air l80 i and original features of construction and passes into the barrel as indicated by the combinations of parts hereinafter set forth arrows. The head 38 is provided with spiral and claimed. v valles 103 located between the plate 100 and Although the novel features which are bethe liner 4l. ,lhe head 38 may be called the lieved to be characteristic of this invention exhaust head because the air, abrasive and 85 will be particularly pointed out in the claims dust pass out through this' head assisted by appended hereto, the invention itself, as to its the vanes 103. Each vdrum'lOl has a flange objects and advantages, the mode of its op- 40 on its periphery thereby forming with the ,mi eration and the manner of its organization projecting liner plate 41 a circular groove 42.

the following description taken in connection Cooperating with the casing 4 and with the with the accompanying drawings forming a barrel heads 38'and 39 and forming the movpart thereof, in which able segment is the endless conveyor 5 suit- ,q Fig. 1 is a vertical sectio'n through a tumably supported upon three pairs of sprockets bling mill; and p 43, 44 and 45, these sprockets being supported Fig. 2 is a section on the line 2-2 of Fig. 1. on suitable shafts, two sprockets on each In the following description and in the shaft. Secured to the casing end walls 6 and claims parts will be identified by specific 7, one on each side, are track members 46 and 50 names for convenience, but theyare intend- 47 for supporting the endless chain at the 100 may be better understood by referring to for a purpose hereinafter described.

point where the articles to be treated exert their weight.

The movable segment or traveling conveyor 5 is made up of chains 52, 53, one on each side, running on the sprockets 43, 44, on each side. These chains are made up of a series of links 54 connected by pins 55 having rollers 56 thereon. Each link 54 has a lateral extension 57 on which seats a pair of angle irons or aprons 58 extending the width of the conveyor from one chain to the other. Each extension 57 has a diagonal sealingn iange 59 riding in abrasive from the tumbling chamber. The angle irons 58 are disposed close together as indicated-in Fig. 1 so that no abrasive can pass through the conveyor. For driving the conveyor a spur gear 85 is mounted upon the shaft 84 which supports the lower sprockets- 44. Drive gear 85 may be driven by a suitable reversible motor (not'shown).

It will be n oted that the chains 52, 53 are voutside of the blasting chamber and are therefore protected from the direct force of the blasting, while only exposed to the blasting are the angle irons 58 and the liners 41 on the barrel heads, all of which maybe replaced when worn. The chain rollers 56 ride on tracks 46,l 47 thereby insuring proper support for the weight of the articles being treated, which may be considerable.

The casing is provided with a composite door 13 comprising an upper section 16 and a lower section 17, this door closing the charge opening. The sections" are suitably pivoted together bhinges 18 and the upper section is suitably pivoted to the `casing by a Vhinge 21. The lower door section 17 carries suitable nozzle holders 29 for supporting nozzles (not shown) which direct abrasivesuch as' sand on the4 articles tobe treated.

a itting 105l is provided comprising, a

l branch 106 and a branch 108. The branch 106 is illustrated as seating in a groove 107 in hub 36 to provide a sealing arrangement at this point. An exhaust fan or other suclhinge 110 is overcome and the gate 109 opens,

allowing the abrasive toy fall upon inclined screenV 112 and thence into pressure tank 113. Y It will be noted from Fig. 1 that the conveyor sags .at its lower part between sprockets 43 andq 44, and that it is taut at other places; Thus the conveyor is self-tightening, the part fitting againsttliefbarrel heads 38 and 39, being kept tight against these heads by the weight of the parts of the conveyor Vbea groove 42 to prevent escape of the' nient of the conveyor causes For removing abrasive and dust from the mill l mOVeS.

Touse the apparatus the door 13 is' opened and the articles to be treated are placed 1n the pocketformed by the movable conveyor 5. The door is then closed to the position shown in Fig. 1 and the driving motor started to rotate the gear 85 in such direction as tocause the conveyorto move in the direction indicated by the arrow the articles upwardly. It will be seen that as these articles are carried upwardly they will slide and tumble down Lcontinuously as the conveyor moves, exposing all sides thereof to the action of the sand blast coming from the nozzles (not shown) in the nozzle holders 29. f

The particles removed from the surface of the articles and the spent abrasive collects upon the conveyor and the draft of air Xin Fig. 1, carrying through the tumbling chamber and movethe abrasive to drift against the head 38. the conveyor againstthe head 38 causes rotation thereof and the abrasive passing through the openings 102 is carried by the vanes 103 and' delivered out through the hollow shaft 36 together with dust into the fitting 105.

lThe dust is carried out through branch 108 while the abrasive falls into the bottomof.

the fitting. The abrasive is delivered to the s creen 112 by the action above described and this screendiscards all coarse particles removed from the articles treated, allowing the abrasive to p ass into' pressure tank 113A where it is picked lup and directed tothenozzle holders 29. The abrasive thereby travels in aclosed path and is-used over and over again.V The air passes" into the mill principally through the opening in shaft 37 and through the vents 12 in the top of thecasing.

After-the articles have been treated suiiciently, if desired the abrasive nozzles are shut off first and the conveyor allowed to run toremoveall loose abrasive from the mill. The suction draft is then shut off and the door 13 opened.' and the driving motor which` drives gear 85 is reversed. This reverses the motion of the'conveyor 5 andquickly carries the articles out through charge opening onto the ioor or receptacle waiting for them.

Thus it will be seen that the above described tumbling rnill is rugged in construction, simple and eicient in operation and occupies but small space. The particular construction of movable conveyor provides,

most useful arrangement in which the worn 'parts may be easily replaced. Theworking The friction of treated. The utilization of a rotating head to convey the abrasive from the machine assists in making a compact construction. Furthermore the vents 12 provide for additionaland necessary air flow into themachine increasing that which is drawn in through the hollow shaft 37 to reduce the resistance to the removal of material through trunnion 36.

This application is a continuation in part of application, Serial N o. 298,194, filed August 8, 1928.

`While certain novel features of the invention have been shown and described and are pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation may be made by those skilled in t-he art witho ut., departing from the spirit of the invention.

What is claimed is:

l. A tumbling mill for cleaning castings and the like comprising a stationary casing, a head in said casing, a conveyor in said casing for tumbling the articles, said head, part of said conveyor and part of said casing forming a tumbling chamber, and means for lemving material from said chamber by said 2. In tumbling apparatus for cleaning castings and the like, a stationary casing, a circular, a hollow head in said casing, a hollow trunnion secured to said head and journalled in said casing, a perforated liner plate secured to said head, vanes within said head, a mov- .able conveyor` adjacent said head for tumbling the articles, and means for rotating said head to remove material from said casing, part of said conveyor, part of said casing and said head forming a tumbling chamber.

3. In tumbling apparatus for cleaning casttings and the like, a stationary casing, circular heads in said casing, the first of said heads comprising a plate, a hollow trunnion secured to said plate and journalled in said casing, a cylindrical wall secured to said plate, a perforated liner plate secured to said cylindrical wall, vanes within said cylindrical wall and extending from said wall to the hollow trun nion, a movable conveyor extending between said'heads for tumbling the articles, a suction device connected to said first hollow trunnion and blast nozzles in said casing, and means for rotating said head by movement of said conveyor, said heads, and complementary parts of said casing and conveyor forming a tumbling chamber.

4. In tumbling apparatus for cleaning castings and the like, a stationary casing, circular heads in said casing, the first of said heads comprising a plate, a hollow trunnion secured to said plate. and journalled in said casing, a cylindrical wall secured to said plate, a, perforated liner plate secured to said cylindrical wall, vanes within said cylindrical wall and extending from said wall to the hollow trunnion, a movable conveyor extending between said heads fortumbling the articles, a suction device connected to said casing, blast nozzles in said easing, said vanes delivering material from said casing out through the hollow trunnion, said heads, and complementary parts of said casing and conveyor forming a. tumbling chamber.

5. In a tumbling apparatus for cleaning castings and the like, a tumbling chamber, means for subjecting the articles being treated in said chamber to a blast of abrasive, a trap having a dump bottom, meansfor applying suction to the top of said trap, means connecting said tumbling chamber to said trap and for delivering spent abrasive and dust thereto, and means for causing said bottom to dump when a. predetermined amount of abrasivefis deposited.

6. In tumbling apparatus for cleaning castings and the like, a stationary casing having vents at the top thereof, a movable conveyor for tumbling the articles in said casing, and

y suction devices for removing matter from the inside of said casing, said Vents operating to reduce the resistance of removing the mattei' from the inside of the casing.

7. In tumbling apparatus for cleaning castings and the like, a stationary casing, a movable conveyor therein, first and second heads with central openings, means j ournalling said heads in said casing, said casing entirely enclosing said conveyor, said casing, said heads and complementary parts of said casingA and conveyor forming a tumbling chamber, means supported by said casing between said heads for supplying a blast of abrasive to the inside of said chamber, means applying a suction to said first central opening, and means whereby spent abrasive is delivered out through said first central opening, said second central opening allowing air to flow into said chamber.

In testimony whereof I have hereunto set m hand.

y LOUIS D. PEIK. 

